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vhost-user-scsi: Introduce vhost-user-scsi host device

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This commit introduces a vhost-user device for SCSI. This is based
on the existing vhost-scsi implementation, but done over vhost-user
instead. It also uses a chardev to connect to the backend. Unlike
vhost-scsi (today), VMs using vhost-user-scsi can be live migrated.

To use it, start Qemu with a command line equivalent to:

qemu-system-x86_64 \
       -chardev socket,id=vus0,path=/tmp/vus.sock \
       -device vhost-user-scsi-pci,chardev=vus0,bus=pci.0,addr=...

A separate commit presents a sample application linked with libiscsi to
provide a backend for vhost-user-scsi.

Signed-off-by: Felipe Franciosi <felipe@nutanix.com>
Message-Id: <1488479153-21203-4-git-send-email-felipe@nutanix.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Felipe Franciosi 2017-03-02 10:25:52 -08:00 • committed by Paolo Bonzini
parent 44cb280d33
commit f12c1ebddf
10 changed files with 315 additions and 1 deletions
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35
include/hw/virtio/vhost-user-scsi.h Normal file
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/*
* vhost-user-scsi host device
*
* Copyright (c) 2016 Nutanix Inc. All rights reserved.
*
* Author:
* Felipe Franciosi <felipe@nutanix.com>
*
* This file is largely based on "vhost-scsi.h" by:
* Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
*
* This work is licensed under the terms of the GNU LGPL, version 2 or later.
* See the COPYING.LIB file in the top-level directory.
*
*/
#ifndef VHOST_USER_SCSI_H
#define VHOST_USER_SCSI_H
#include "qemu-common.h"
#include "hw/qdev.h"
#include "hw/virtio/virtio-scsi.h"
#include "hw/virtio/vhost.h"
#include "hw/virtio/vhost-scsi-common.h"
#define TYPE_VHOST_USER_SCSI "vhost-user-scsi"
#define VHOST_USER_SCSI(obj) \
OBJECT_CHECK(VHostUserSCSI, (obj), TYPE_VHOST_USER_SCSI)
typedef struct VHostUserSCSI {
VHostSCSICommon parent_obj;
uint64_t host_features;
} VHostUserSCSI;
#endif /* VHOST_USER_SCSI_H */